Automatic low-water fuel shut-off.



E. G. OFELDT.

AUTOMATIC LOW WATER FUEL SHUT-OFF.

APPLICATION FILED sun: 1. ms.

' 1,288,149 Iatented Dec.17,1918.

LVENTOR NESSES [Ir/Mays r a null: runs co. rnmulmz. nsuwcmn. n cy TQFICE.

ERNEST G. OFELIDT, OF NYACK, NEW YORK.

AUTOMATIC LOW-WATER FUEL SHUT-OFF.

Application filed June 7, 1918. Serial No. 238,729.

To all QUILOHL it may concern:

Be it known that I, ERNEST G. OFELDT, a citizen of the United States,and a resident of Nyack-on-the-Hudson, in the county of Rockland andState of New York, have invented certain new and useful Improvements inAutomatic Low-Water Fuel Shut- Ofls; and I do hereby declare thefollowing to 'be a full, clear, and eXact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to improvements in automatic low water fuelshut-offs and par' ticularly to such as are adapted for use incontrolling the supply of fuel to the burners of a steam boilerfurnace,the object of the invention being to provide simple andellicient means operative automatically when the water level in theboiler descends abnormally to stop the supply of fuel to the burners andpermit the fuel supply valve to be opened manually.

With this and other objects in view, the invention consists in certainnovel features of construction and combinations of parts as hereinafterset forth and pointed out in the claims.

In the accompanying drawings, Figure l is a view in side elevationpartly broken away, of a regulator embodying my invention, and Fig. 2 isa view partly in section, taken at right angles to Fig. 1.

1 represents a float chamber or receptacle which may have a generaltapering shape and provided at its larger end with nipples 2, 3 adaptedfor the reception of suitable pipes (not shown) for connecting saidfloat chamber or receptacle with a steam boiler above and below thenormal water level thereof.

A shaft 4 is mounted in suitable bushing 5 entering the smaller end ofthe receptacle 1, said shaft terminating at its inner end within saidreceptacle. A float 6 capable of withstanding steam pressure, is locatedwithin the larger portion of the receptacle 1 and is connected, by anarm or lever 7 with the inner end of the shaft 4:. An arm 8 is securedto the projecting end of the shaft 4 and with the free end of this arm,one end of a tubular rod 9 is connected, by means of a coupling 10pivoted to said arm and threaded into the upper end of said tubular rod.The stem 11 of a valve 12 enters the lower 1 Specification of LettersPatent.

Patented Dec. 1'7, 1918.

endof the tubular rod 9 and is freely movable in the same,the casing 13of said valve being adapted for connection with a source of fuel supplyand with the burners of a steam boiler furnace.

An annular disk or collar 14; is secured to valve stem 11 and the curvedupper end portion 15 of a spring 16 engages said disk and operatesnormally to hold the fuel valve open, said spring being provided at itslower end with a lateral portion 17 secured to the valve casing.

Under normal conditions, the fuel valve will be held open by the spring16 and the fuel (either liquid or gaseous) will be permitted to flow tothe burners, but when the level of the water in the boiler falls belownormal, the descent of the float 6 will cause a partial rotation of theshaft 4 and motion will be imparted, through the arm 8 to the tubularrod 9, causing the latter to engage the disk 14, overcome the resistanceof the spring 16 and effect the closing of the valve 12 to stop thesupply of fuel to the burners. When the water level again becomesnormal, the valve 12 may be opened manually and latched by the spring 12and disk 14.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is:

1. In a control device, the combination with a chamber adapted forconnection with a boiler above and below the normal water level, of ashaft entering said chamber, a float within said chamber operatively connected with said shaft, an arm secured to the projecting portion of saidshaft, a rod connected with said arm, and a fuel valve having a part tobe engaged by said rod to force said fuel valve toward its seat when thefloat descends abnormally.

2. In a control device, the combination with a chamber adapted forconnection with a boiler above and below the normal water level, of ashaft entering said chamber, a float connected with said shaft, a fuelvalve, an arm on said shaft, a rod connected with said arm and havingmovable relation to the stem of the valve, an enlargement on the stem ofthe valve in position to be engaged by said rod, and a spring latchdevice to engage said enlargement and normally hold the valve open.

3. In a control device, the combination with a chamber adapted forconnection with a boiler above and below the normal Water In testimonywhereof, I have signed this level, of a shaft entering said chamber, aspecification in the presence of two subscrib- I0 float connected withsaid shaft, an arm on. ing Witnesses.

said shaft, a tubular rod connected with said ERNE ST G. OFELDT arm, afuel valve having a stem entering said tubular rod, a disk on the valvestem, Witnesses:

and a spring to engage said disk and nor- 7 J. W. PoLHEMUs,

mally hold the fuel valve open. L. C. POLHEMUS,

floyie-s oi this patenfi may be obtained for five cents each, byaddreeeing the Commissioner e2 mum, Washington, D. K3.

